9917278502657 has 2 divisors, whose sum is σ = 9917278502658. Its totient is φ = 9917278502656.

The previous prime is 9917278502647. The next prime is 9917278502851. The reversal of 9917278502657 is 7562058727199.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5083924619536 + 4833353883121 = 2254756^2 + 2198489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9917278502657 is a prime.

It is not a weakly prime, because it can be changed into another prime (9917278502647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4958639251328 + 4958639251329.

It is an arithmetic number, because the mean of its divisors is an integer number (4958639251329).

Almost surely, 2^{9917278502657} is an apocalyptic number.

It is an amenable number.

9917278502657 is a deficient number, since it is larger than the sum of its proper divisors (1).

9917278502657 is an equidigital number, since it uses as much as digits as its factorization.

9917278502657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 133358400, while the sum is 68.

The spelling of 9917278502657 in words is "nine trillion, nine hundred seventeen billion, two hundred seventy-eight million, five hundred two thousand, six hundred fifty-seven".